Grouvellinus wangmoensis, Jiang & Wu & Chen, 2024

Jiang, Ri-Xin, Wu, Ping-Lan & Chen, Xiang-Sheng, 2024, Five new species of the genus Grouvellinus Champion, 1923 from Guizhou Province, China (Coleoptera, Elmidae), ZooKeys 1219, pp. 73-97 : 73-97

publication ID	https://doi.org/ 10.3897/zookeys.1219.125754
publication LSID	lsid:zoobank.org:pub:4281D66E-AE5B-4F65-B5C1-92D02B3BFBF6
DOI	https://doi.org/10.5281/zenodo.14232177
persistent identifier	https://treatment.plazi.org/id/CC680CE8-019B-5A1C-9F17-141A47264173
treatment provided by	ZooKeys by Pensoft
scientific name	Grouvellinus wangmoensis
status	sp. nov.

Treatment

Grouvellinus wangmoensis sp. nov.

Figs 1 C View Figure 1 , 6 View Figure 6 , 7 View Figure 7 , 12 C, H View Figure 12

Material examined.

(31 exs: 11 ♂♂, 20 ♀♀): Holotype: China • ♂, labeled ‘ China: Guizhou, Qiannan Buyi and Miao Autonomous Prefecture (黔南布依族苗族自治州), Wangmo County (望谟县), Mashan Town (麻山镇), Kafa Village (卡法村), H: ~ 857 m, 10. VII. 2022, Jiang Ri-Xin leg. ’ ( GUGC) . Paratypes: China • 10 ♂♂, 20 ♀♀, with same label data as the holotype ( GUGC) .

Diagnosis.

Body long-oval, dark brown, with weak cupreous metallic luster. Pronotum widest at base, surface finely covered with small punctures, portions of anterior and posterior angles distinctly wrinkled. Base of pronotum with a pair of round foveae located at middle. Elytron interval VIII carinated. Median sulcus of metaventrite thin but distinct, extending from base to 3 / 4 length of metaventrite. Aedeagus with median lobe slightly longer than parameres, finely narrowed from basal 1 / 3 to apex, basal 1 / 6 distinctly narrowed, apex rounded and weakly expanded. Parameres of aedeagus very thin, weakly curved, apex rounded, lateral portion with long setae at apical 1 / 3, apex with several much longer setae.

Description.

Male. Body elongate-oval (Fig. 1 C View Figure 1 ), dark brown with cupreous metallic luster, tibiae, antennae, and elytra light brown. Plastron area confined to head, except for frons, vertex and clypeus, lateral portions of prosternum, ninth elytral interval and epipleura, lateral portions of mesosternum, metaventrite, abdomen, and surfaces of femora.

Head (Fig. 6 A View Figure 6 ) wider than long, dorsal surface shiny, densely covered with short setae (except discal part) and with sparse large punctures, each bearing a longer seta. Surface of clypeus shiny, with sparse small punctures and each bearing a long seta. Labrum transverse, approximately as long as clypeus, surface shiny, basal 1 / 2 hairless, apical 1 / 2 with sparse short setae, lateral margins with long bristles, apical margin rounded.

Pronotum (Fig. 6 B View Figure 6 ), slightly wider than long, widest at base, narrowed anteriad. Surface shiny, disc finely with sparse small punctures and long setae, surface of anterior and posterior angles distinctly wrinkled. Longitudinal impression absent, with a pair of small round foveae at middle of pronotal base. Anterior margin arcuate, anterior angles distinctly produced and acutangular. Lateral margins finely curved. Basal margin trisinuate, emarginated before scutellum, posterior angles acutangular. Sublateral carinae short, ~ 1 / 5 length of pronotum, each side of carinae with a shallow and indistinct oblique impression, not touch the apex of sublateral carinae, extending from basal 1 / 3 of pronotum to near anterior angle. Prosternal process (Fig. 6 D View Figure 6 ) with apex weakly rounded, surface distinctly wrinkled sparsely covered with large punctures and long setae.

Scutellum (Fig. 6 B View Figure 6 ) widely triangular, approximately as long as wide, widest at base; surface weakly wrinkled, with several large punctures, each bearing seta which in different length. Lateral margins finely curved, apex obtuse.

Elytra (Fig. 6 C View Figure 6 ) ~ 1.5 × as long as wide, widest at base, narrowed to apex. Surface lighter in color than head and pronotum, shiny, with cupreous metallic luster and rows of sparse long setae. Strial punctures large in basal 2 / 3, separated by ~ 1.5 × diameters, and much smaller and widely separated in apical 1 / 3. Granulated carina on interval VIII, other intervals flat. Hind wings well developed.

Metaventrite (Fig. 6 D View Figure 6 ), surface rough and finely with long setae and large round punctures at disc. Median sulcus distinct, extending from posterior margin to 3 / 4 length of metaventrite. A pair of small round impression located at basal sides of median sulcus. Lateral sides of disc with series of elliptical shallow impression.

Abdomen. Base of ventrite I (Fig. 6 D View Figure 6 ) weakly wrinkled, middle portions of ventrites I – IV and anterior part of ventrite V shiny (Fig. 6 D View Figure 6 ), finely covered with large punctures, each puncture bearing a long seta. Other parts of abdomen (Fig. 6 D View Figure 6 ) with plastron and mixed with sparse long setae. Apex of ventrite V weakly curved. Ventrite I with a pair of well-developed admedian carinae, curved at middle, extending from base to apex.

Legs simple, surface granulated; femora widened, surface with plastron; inner side of tibiae with cleaning fringes; tarsi slightly shorter tibiae; tarsal claws simple.

Genitalia. Aedeagus (Fig. 7 A – D View Figure 7 ), long and slender, symmetrical; median lobe slightly longer than parameres, distinctly narrowed at basal 1 / 5, apical 4 / 5 finely get narrowed from base to apex, with apex rounded. Parameres (Fig. 7 D View Figure 7 ) thin, weakly curved to inner side, with apex rounded; apical 1 / 2 with long setae, apex of paramere with several much longer setae.

Female. Externally similar to the male, averagely larger. Ovipositor as in Fig. 12 C, H View Figure 12 . Stylus short and narrow, very weakly curved at base, ~ 1 / 4 as long as distal portion of coxite. Coxite long, apex distinctly expanded, roundly broadened at outer margin, and with several short and curved sensilla. Distal portion of coxite nearly straight, surface finely covered with very short and acute setae. Proximal portion of coxite short, ~ 1 / 2 the length of distal portion, surface finely covered with very short and acute setae. Valvifers longer than coxite, longitudinal baculum curved.

Measurements.

Male (n = 10): CL: 2.10–2.23 mm (2.18 ± 0.04); PL: 0.60–0.62 mm (0.62 ± 0.01), PW: 0.73–0.82 mm (0.76 ± 0.03); EL: 1.49–1.61 mm (1.56 ± 0.03), EW: 0.95–1.04 mm (0.99 ± 0.03).

Female: CL (n = 10): 2.20–2.27 mm (2.24 ± 0.02); PL: 0.56–0.64 mm (0.61 ± 0.03), PW: 0.73–0.78 mm (0.76 ± 0.02); EL: 1.61–1.63 mm (1.62 ± 0.01), EW: 1.02–1.04 mm (1.03 ± 0.01).

Distribution.

China: Guizhou.

Biology.

All adults were collected from submerged stone in small ravine stream (Fig. 15 F View Figure 15 ).

Etymology.

The specific epithet refers to the type locality: Wangmo County (Guizhou, China); the name is treated as an adjective.

Comparative diagnosis.

The new species is similar to Grouvellinus pilosus Jeng & Yang, 1998 , G. huaxiensis Jiang, Huang & Chen, 2023 , G. muyinlini sp. nov., and G. lihaitaoi sp. nov. in habitus. Grouvellinus wangmoensis sp. nov. can be distinguished from G. pilosus by the following characters: 1) base of pronotum with a pair of rounded foveae in middle (vs with a pair of elongate oval impressions), 2) granulated carinae present on elytron strial interval VIII (vs granulated carinae present on elytron strial interval VII). The new species can be easily distinguished from the other three species mentioned above by the sublateral carinae of pronotum being very short, not in contact with the oblique impression, and by the thin slender parameres of the aedeagus.